Appeal 2006-2650
Application 10/011,886
Independent Claim 1 is reproduced below:
1. An optical information medium for erasable recording by means of
a laser-light beam having a laser-light wavelength, said medium
having a substrate having a reflective layer and a stack of layers
provided thereon, the stack comprising a first dielectric layer and a
second dielectric layer, a recording layer that is able to change
between an amorphous and a crystalline state, arranged between the
first dielectric layer and the second dielectric layer, and a reflective
layer [sic], wherein the first dielectric layer is formed on a first side of
the recording layer near the substrate, and the second dielectric layer
is formed on a second side of recording layer,
characterized in that
- the recording layer comprises a compound of the formula GexTe100-x,
wherein: x is a fraction of Ge in at.% and 30 < x < 70,
- the first dielectric layer has a thickness of at most 15nm and further
comprises a compound selected from the group consisting of oxides of
Ta and Si, nitrides of Si and Al and carbides of Si, and is present in
contact with the recording layer.
The Examiner relies on the following prior art references to show
unpatentability:
Tyan US 4,797,871 Jan. 10, 1989
Kobayashi JP 01-290135 A Nov. 22, 1989
Kojima EP 0 898 273 A2 Feb. 24, 1999
Zhou US 6,040.066 Mar. 21, 2000
Kasami US 6,312,780 B1 Nov. 6, 2001
Uno US 6,477,135 B1 Nov. 5, 2002
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